Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"turbo machinery"”.
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Feasibility of electrostatic bearings for micro turbo machinery
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Development of magnetic induction machines for micro turbo machinery
This thesis presents the nonlinear analysis, design, fabrication, and testing of an axial-gap magnetic induction micro machine, which is a two-phase planar motor in which the rotor is suspended above the stator via mechanical springs, or tethers. The micro motor is fabricated from thick layers of …
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Advanced analysis of rotor-bearing systems for stability and response
… part in the analysis and design of industrial turbo machinery. Rotor dynamics deals predominantly with the evaluation of the stability and damped critical speeds, and the response to an unbalance excitation, of turbomachinery. The majority of the industries which deal with rotor dynamics use …
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Compressed air storage for electricity generation in South Africa
… generated (R/kWh). Two of the most likely CAES turbo-machinery configurations suitable for South Africa were evaluated in chapter five, conceptual designs and cost analysis. The two types of CAES were conventional CAES and CAES with pressurised fluidised bed combustors (CAESIPFBC). Available …
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Assessment of compressed air energy storage system (CAES)
… the 80 percent for PHES. The exergy destroyed in turbo-machinery contributes to 79 percent, and the remaining due to heat loss from cavern, oil tanks and energy lost in exhaust air. Based on the current data on the capital and energy storage costs that accounts for the round trip efficiencies, it …
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Development of a new shock capturing formula for pressure correction methods
… have been developed to capture shock waves in turbo machinery flows, such as Moore's pressure correction procedure and Denton's time marching procedure. The time marching procedure is traditionally used for transonic flow calculations, whereas the pressure correction method is better suited for …
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Theory for hydrostatic gas journal bearings for micro-electro-mechanical systems
… (less than one cubic centimeter), the micro-turbo-machinery must be spun at a rotational speed on the order of million rpm. This ultra-high rotational speed, together with the small length-to-diameter ratio (L/D<0.07) limited by the chip manufacturing technology, entails many challenges in …
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An experimental study of improvement of a micro hydro turbine performance
… in Iran, is discussed. The theory of turbo machinery, particularly with regard to axial flow turbines, is presented next. This is followed by some details on the design of guide vanes, runner blades and draft tube of axial flow turbines, these components being usually regarded as areas …
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Scattering by porous aerofoil adaptations
… edges of aerofoils, as well as contributing to turbo-machinery noise through fan blades and guide vanes. The study of owl flight has led to numerous bio-inspired adaptations designed to reduce aerodynamic noise passively. Firstly, through material changes: porosity, elasticity, and surface …
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Control for transient response of turbocharged engines
… for downsized units are recovered by means of turbocharging. The transient response of such engines is, however, affected by the static and dynamic characteristics of the turbo-machinery. Recent advances in engine simulation and control tools have been employed for the purpose of the research …
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Analytical and numerical techniques for wave scattering
… as an unwrapped model of the fan components in turbo-machinery. Our contributions include a novel semi-analytical solution based on the Wiener–Hopf technique that extends previous work by lifting the restriction that adjacent blades overlap, and a comprehensive study of the composition of the …
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Eddy current displacement sensor with LTCC technology
… such as a blade tip sensing systems in turbo-machinery. <br>In this work, first literature and information were collected and compared. An eddy current displacement sensor using the novel LTCC technology was found to match the related measurement conditions such as harsh and high …
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Measurement Drift in 3-Hole Yaw Pressure Probes From 5 Micron Sand Fouling at 1050° C
3-hole pressure probes are capable of accurately measuring flow angles in the yaw plane. These probes can be utilized inside a jet engine hot section for diagnostics and flow characterization. Sand and other particulate pose a significant risk to hot section components and measurement devices in …
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Advancements of Particle-Surface Interaction Studies through Novel Measurement Technique Development and Engineering Modelling
Turbomachinery operating on aircraft are often exposed to dusty or sandy environments during typical service. Engines on commercial and military flights operating in desert regions such as the Middle East or even Phoenix, Arizona can become severely damaged by ingesting dirt, grit, sand, and dust. …
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Numerical and experimental investigation of VG flow control for a low-boom inlet
… (AIP), which marks the inflow to the jet engine turbo-machinery. Supersonic VGs were investigated to reduce the shock-induced flow separation near the throat while subsonic VGs were investigated to reduce boundary layer radial distortion at the AIP. To guide large-scale inlet experiments, …
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Towards Predictive Eddy Resolving Simulations for Gas Turbine Compressors
This thesis aims to explore the potential for using large eddy simulation (LES) as a predictive tool for gas-turbine compressor flows. Compressors present a significant challenge for the Reynolds Averaged Navier-Stokes (RANS) based CFD methods commonly used in industry. RANS models require …
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Multi-Fidelity Study of Complex Multi-Scale Flows Concerning Stagnation Probes
The work in this thesis aims to highlight, quantify the loss sources related to the use of stagnation probes in aero-engines through the use of RANS and high fidelity wall-resolved Large Eddy Simulations (LES), and help develop methods and techniques to aid in improving their design to reduce the …